Credit note: correcting an invoice without deleting it

A credit note is a document that reduces the amount a customer owes on an invoice already issued. It is used for a return, an overcharge, a discount agreed after the fact, or a cancelled order — anywhere the original invoice is wrong or no longer fully payable.

The rule underneath it is one people rediscover uncomfortably: a sent invoice is not editable. Once it has gone to the customer and entered your sales ledger, changing the figure or deleting the record breaks sequential numbering, contradicts what the customer holds, and in most tax regimes is not permitted. The correction is a new document that references the old one.

What a credit note contains

• A unique credit note number from its own sequence, and the date.
• A reference to the original invoice — number and date — so the pair can be matched years later.
• What is being credited, itemised, with quantities where goods are going back.
• The reason. Return, overcharge, discount, cancellation. This is what makes the document defensible to an auditor and comprehensible to the customer.
• Tax treated correctly: the tax on the credited amount reversed at the rate applied on the original invoice, not the current one.
• The remaining balance, if the credit is partial, so the customer knows what to pay.

Credit note, debit note, refund

Three related things that are not interchangeable. A credit note is issued by the supplier and reduces what the customer owes. A debit note is issued by the customer to say they believe they owe less, or by a supplier to charge more — usage varies by country and by trade, which is why it causes confusion. A refund is the movement of money back; a credit note is the accounting document that justifies it. You can issue a credit note without refunding anything, if the customer has other unpaid invoices to set it against — and doing so is often preferable for both sides.

1. Establish what is actually wrong and by how much before issuing anything.
2. Issue the credit note against the specific invoice, with the reason stated.
3. Apply it: either against the outstanding balance, or refund the money if there is nothing to set it against.
4. Reconcile the customer account so the remaining balance is correct — this is the step that gets missed and produces chasing letters for money that was already credited.
5. Adjust the tax return for the correct period, according to the rules where you are.

Never issue a credit note for the full amount as a way of cancelling an invoice you sent to the wrong customer or duplicated. That works numerically and leaves an unexplained pair of documents. Issue it with the reason recorded — duplicate, issued in error — because the auditor asking three years later is asking exactly that question, and the number alone does not answer it.

The tax side, briefly

Where sales tax or VAT applies, a credit note usually has to reverse the tax at the rate on the original invoice and be reflected in the period in which it is issued. Several regimes prescribe both timing and mandatory content, and a few require the customer's acknowledgement for certain adjustments. Those rules are specific to your jurisdiction and worth confirming with your accountant rather than inferring — this is the kind of detail where a general article stops being useful.

Not every amount that leaves the ledger does so by agreement. A bad debt is written off because you decided to stop pursuing it, which is a different entry with a different reason and should never be disguised as a cancellation.

Where it lives

Ettex Books holds the credit note against the invoice it corrects, so the customer balance and the ledger move together rather than in two separate steps somebody has to remember. The invoice it references is issued in Ettex Invoices, and the receivables position it changes is covered in accounts receivable.

Being clear: we do not calculate your tax position, do not file returns and do not know the credit note rules of your jurisdiction. What we provide is the document, its link to the original invoice, and the effect on the customer balance.